Answer to Question 1
A data flow diagram (DFD) is a picture of the movement of data between external entities and the processes and data stores within a system. A context diagram shows the scope of the system, indicating which elements are inside and which are outside the system. Second, DFDs of the system specify which processes move and transform data, accepting inputs and producing outputs. These diagrams are developed with sufficient detail to understand the current system and to provide notation as well as illustrate important concepts about the movement of data between manual and automated steps, and they offer a way to depict work flow in an organization. DFDs continue to be beneficial to information systems professionals as tools for both analysis and communication.
Answer to Question 2
A
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